Publish battery level to MQTT

src/main.cpp

@@ -45,6 +45,7 @@ void startFetchingPosition(uint16_t shadeID, int8_t targetPosition);
 
 void publishPosition(const String& shadeName, const uint8_t position);
 void publishState(const String& shadeName, const String& state);
+void publishBattery(const String& shadeName, const uint8_t battery);
 
 void publishDiscoveryTopics();
 
@@ -130,6 +131,15 @@ void processPacket(const Packet *packet) {
             publishPosition(shades[i].name, position);
           }
         }
+      } else if (field.identifier == 0x42) {
+        for (size_t i = 0; i < shades.size(); i++) {
+          if (packet->source == shades[i].ID) {
+            uint8_t value = std::get<uint8_t>(field.value);
+            uint8_t battery = uint8_t(((float)value / 200) * 100);
+
+            publishBattery(shades[i].name, battery);
+          }
+        }
       }
     }
   }
@@ -207,9 +217,11 @@ bool sendFetchPosition(uint16_t destination) {
   
   std::vector<Field> fields;
   
-  uint8_t identifier = 0x50; // position
-  FieldType type = FieldType::FETCH;
-  fields.push_back(Field{identifier, type, false, std::monostate{}});
+  // position
+  fields.push_back(Field{0x50, FieldType::FETCH, false, std::monostate{}});
+
+  // battery
+  fields.push_back(Field{0x42, FieldType::FETCH, false, std::monostate{}});
   
   packet.parameters = FieldsParameters {fields};
   
@@ -331,6 +343,10 @@ void publishPosition(const String& shadeName, const uint8_t position) {
   client.publish("hotdog/" + shadeName + "/position", String(position), true);
 }
 
+void publishBattery(const String& shadeName, const uint8_t battery) {
+  client.publish("hotdog/" + shadeName + "/battery", String(battery), true);
+}
+
 void publishDiscoveryTopics() {
   char buffer[1024];